1021000203 has 12 divisors (see below), whose sum is σ = 1496790568. Its totient is φ = 670507200.

The previous prime is 1021000157. The next prime is 1021000217. The reversal of 1021000203 is 3020001201.

It is a happy number.

It is not a de Polignac number, because 1021000203 - 2⁶ = 1021000139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021000103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 845998 + ... + 847203.

Almost surely, 2^1021000203 is an apocalyptic number.

1021000203 is a deficient number, since it is larger than the sum of its proper divisors (475790365).

1021000203 is a wasteful number, since it uses less digits than its factorization.

1021000203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693274 (or 1693271 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1021000203 is about 31953.0937938723. The cubic root of 1021000203 is about 1006.9516305202.

Adding to 1021000203 its reverse (3020001201), we get a palindrome (4041001404).

The spelling of 1021000203 in words is "one billion, twenty-one million, two hundred three", and thus it is an aban number.